Sources said the biggest party in the United Progressive Alliance (UPA) government has decided to crack down on corruption without buckling under coalition pressure, even if that means snapping ties with the DMK, a key partner in the alliance.

Congress is waiting for the DMK reaction after the massive raids by Central Bureau of Investigation (CBI) on Raja, his relatives and people close to the DMK first family.

Sources said the Congress top brass is of the view that the raids would rob coalition partner's power to arm-twist the government on the issue of corruption. The party is anticipating a strong reaction from the DMK after the raids.